Shakyamuni Buddha was the founder of Buddhism. All buddhism is, is a way to end suffering. Zen, in particular, is a method of aligning yourself so that true awakening can happen. The Heart Sutra, or, "The Prajna Paramita Hridaya", is the seminal Sutra of many buddhist sect, especially Zen Buddhism.
THe word, "Prajna", in Sanskrit means, "before knowledge", or "Wisdom" Wisdom is not knowledge, wisdom comes before knowledge.
Zazen is a means to allow the true nature of all human beings to blossom and ripen so that we can find our way to our, "Original Dwelling Place", as Roshi Robert Aitken says. My teacher has said many times in Sesshin, that all humans eventually wind up on the cushion. We all have the innate drive to return to our Original Place. However, neither Zen or any other religion or spiritual discipline has a monopoly on awakening, or enlightenment, if you will. There are many, many ways up the mountain. For me personally, Zen is the way that has made the most sense to me and after many years of practice, I find this jewel is forever opening.
If you are interested, one of the best books that I have read is one by Albert Low, who is the teacher of the Montreal Zen Center and is a Dharma heir of Phillip Kapleau Roshi. The title of this book is: "To Know Yourself", and can be bought at Amazon.com. There are used editions that are very reasonable.